{"instruction": "You are an expert in event argument extraction. Please extract event arguments and their roles from the input that conform to the schema definition, which already includes event trigger words. If an argument does not exist, return NAN or an empty dictionary. Please respond in the format of a JSON string.", "schema": [{"event_type": "discover vulnerability", "arguments": ["common vulnerabilities and exposures", "discoverer", "vulnerable system owner", "supported platform", "vulnerable system", "vulnerability", "capabilities", "vulnerable system version", "time"]}], "input": "Swedish researcher Ulf Frisk discovered the January and February Meltdown mitigations for Win7 and Server 2008 R2 were broken , and went public with his findings once the March Patch Tuesday had kicked off ."}
{"discover vulnerability": [{"common vulnerabilities and exposures": "NAN", "discoverer": "Swedish researcher Ulf Frisk", "vulnerable system owner": "NAN", "supported platform": "NAN", "vulnerable system": ["Win7", "Server 2008 R2"], "vulnerability": "Meltdown", "capabilities": "NAN", "vulnerable system version": "NAN", "time": "NAN"}]}